521400000000 has 720 divisors, whose sum is σ = 1918124017920. Its totient is φ = 124800000000.

The previous prime is 521399999999. The next prime is 521400000001. The reversal of 521400000000 is 4125.

It is an interprime number because it is at equal distance from previous prime (521399999999) and next prime (521400000001).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521400000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6599999961 + ... + 6600000039.

It is an arithmetic number, because the mean of its divisors is an integer number (2664061136).

Almost surely, 2^521400000000 is an apocalyptic number.

521400000000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521400000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959062008960).

521400000000 is an abundant number, since it is smaller than the sum of its proper divisors (1396724017920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521400000000 is an frugal number, since it uses more digits than its factorization.

521400000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

Adding to 521400000000 its reverse (4125), we get a palindrome (521400004125).

The spelling of 521400000000 in words is "five hundred twenty-one billion, four hundred million", and thus it is an aban number.